Asynchronous binding

Binding.IsAsync allows loading the binding source asynchronously, without blocking the application UI. When using Binding.IsAsync, WPF will use a ThreadPool thread to resolve the binding asynchronously. When the data is available from the binding source, it is copied to the Target property.

1. Let us create a small WPF application with just a TextBlock that displays the message of the day.

   

   The previous view can be defined in XAML, as follows:

   <Window x:Class="MVVMAppPerformanceimprovement.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:local="clr-namespace:MVVMAppPerformanceimprovement"
           Title="MVVM Survival Guide" Height="250" Width="400">
       <Window.DataContext>
           <local:MainWindowViewModel />
       </Window.DataContext>
       <Grid>
           <TextBlock  Width="300" Height="56" Foreground="White"
                      ...